Fermion mass generation in SO(10) with a unified Higgs sector
- Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)
- Department of Physics and Astronomy, University of Delaware, Nework, Delaware 19716 (United States)
- Department of Physics, Northeastern University, Boston, Massachusetts 02115-5000 (United States)
An analysis of generating fermion masses via cubic couplings in SO(10) grand unification with a unified Higgs sector is given. The new framework utilizes a single pair of vector-spinor representation 144+144 to break the gauge symmetry all the way to SU(3){sub C}xU(1){sub em}. Typically the matter-Higgs couplings in this framework are quartic and lead to naturally suppressed Yukawa couplings for the first two generations. Here we show that much larger third generation couplings naturally arise at the cubic level with additional matter in 10-plet and 45-plet representations of SO(10). Thus the physical third generation is a mixture of 16, 10, and 45-plet representations while the remaining components become superheavy and are removed from the low energy spectrum. In this scenario it is possible to understand the heaviness of the top in a natural way since the analysis generates a hierarchy in the Yukawa couplings so that h{sub t}/h{sub b}>>1 where h{sub t}(h{sub b}) are the top (bottom) Yukawa couplings. It is then possible to realize values of tan{beta} as low as 2, which also helps to stabilize the proton.
- OSTI ID:
- 20871330
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 74, Issue 7; Other Information: DOI: 10.1103/PhysRevD.74.075004; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Unified framework for symmetry breaking in SO(10)
Fermion masses and mixings in a {mu}-{tau} symmetric SO(10)